Passenger/driver sit still in moving cars: seat pose sent relative to the vehicle (backward-compatible), no backward pull; remote cars/traffic extrapolate in physics time and interpolate; UI polish (shadows, borders, gradient buttons, server list hover, fill bars, colored ping)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Toasts.cs

@@ -53,6 +53,7 @@ namespace MSCO
 
                 var r = new Rect(Screen.width - 12 - Width + (1f - slide) * (Width + 20f), y, Width, Height);
                 GUI.color = new Color(1f, 1f, 1f, alpha);
+                UiTheme.DrawShadow(r);
                 GUI.Box(r, GUIContent.none, box);
 
                 GUI.color = new Color(t.Dot.r, t.Dot.g, t.Dot.b, alpha);
@@ -73,7 +74,7 @@ namespace MSCO
         void EnsureStyles()
         {
             if (box != null && box.normal.background != null) return;
-            box = UiTheme.Panel9(new Color(0.06f, 0.06f, 0.07f, 0.88f), 6);
+            box = UiTheme.Card(new Color(0.06f, 0.06f, 0.07f, 0.92f), 6);
             title = new GUIStyle(GUI.skin.label) { fontSize = 13, fontStyle = FontStyle.Bold, alignment = TextAnchor.MiddleLeft };
             title.normal.textColor = Color.white;
             title.wordWrap = false;